SYSTEM AND METHOD FOR QUALITY ASSURANCE OF A BIOSENSOR TEST STRIP

• US 20090251158A1
• Filed: 06/15/2009
• Published: 10/08/2009
• Est. Priority Date: 06/18/2004
• Status: Active Grant

• Current Assignee: Roche Diabetes Care Inc. (Roche Holding AG)
• Original Assignee: Roche Operations Limited (Roche Holding AG)
• Inventors: Groll, Henning, Celentano, Michael J., Moore, Steven K., Pauley, James L.
• Granted Patent: US 8,092,668 B2
• Time in Patent Office: Days
• US Class Current: 324/713
• CPC Class Codes: G01N 27/327 Biochemical electrodes , e.g. electrical or mechanical details for in vitro measurements
• CPC Class Codes: G01N 27/3273 Devices therefor, e.g. test element readers, circuitry details not specific to biochemical electrodes G01N33/4875
• CPC Class Codes: G01N 27/3274 Corrective measures, e.g. error detection, compensation for temperature or hematocrit, calibration coding of calibration information G01N33/48771
• CPC Class Codes: G01N 27/4163 checking the operation of, or calibrating, the measuring apparatus G01N27/3274, G01N27/4175 and G01N33/0006 take precedence

Abstract

The present invention provides a test strip for measuring a signal of interest in a biological fluid when the test strip is mated to an appropriate test meter, wherein the test strip and the test meter include structures to verify the integrity of the test strip traces, to measure the parasitic resistance of the test strip traces, and to provide compensation in the voltage applied to the test strip to account for parasitic resistive losses in the test strip traces.

Claims

1. A method for determining if the parasitic resistance in a conductive trace of a biosensor is acceptable, the method comprising the steps of:

a) coupling a first end of a known resistance to a first end of the first conductive trace;

b) applying a voltage to a second end of the first conductive trace;

c) measuring a current flowing at a second end of the known resistance;

d) calculating a parasitic resistance of the first conductive trace using the applied voltage, the measured current, and the known resistance; and

e) comparing the calculated parasitic resistance to a predetermined threshold.

2. The method of claim 1, further comprising the step of:

f) if the calculated parasitic resistance is greater than the predetermined threshold, notifying a user of the biosensor.

3. A method for determining if the parasitic resistance in a conductive trace of a biosensor is acceptable, the method comprising the steps of:

a) coupling a first end of a known resistance to a first end of the first conductive trace;

b) applying a voltage to a second end of the known resistance;

c) measuring a current flowing at a second end of the first conductive trace;

d) calculating a parasitic resistance of the first conductive trace using the applied voltage, the measured current, and the known resistance; and

e) comparing the calculated parasitic resistance to a predetermined threshold.

4. The method of claim 3, further comprising the step of:

f) if the calculated parasitic resistance is greater than the predetermined threshold, notifying a user of the biosensor.